Screw-propeller.



'A. R. WEISZ. SCREW PROPELLER. APPLICATION FILED DEC. 28, 1907.

91 5,255; Patented Mar. 16, 1909.

a n a up I19 7 'lmmlmi Q ALBERT RICHARD WEISZ, OF BROOKLYN, NEW YORK, ASSIGNOR, BY DIRECT AND MESNE UNITED STATES, PATENT ornron.

ASSIGNMENTS, TO WEISZ ROTARY PISTON AND ATMOSPHERIC MOTOR COMPANY, A OR- PORATION OF NEW YORK.

SCREW-PROIEELLEB.

Specification of Letters Patent.

I Application filed December 28, 1907.

Patented March 16, 1909.

Serial No. 408,895.

ing the tube before it reaches the propeller.

I have found thatin disposing the propeller described in the patent above referred to rather far away from the mouth of the inlet tube, which for structural reasons isof a certain advantage, the water drawn by the propeller into the tube is inclinedto assume a whlrling motion, tending to follow the motion of the propeller before it reaches the same, so that the action of the propeller blades may be rendered under certain circumstances ineffective. This whirling ino' tion of the water in front of the ropeller will increase with the number of b ades on the propeller and will also increase, the farther the propeller is disposed back in the tube. V

In order to compel the water to run through the tube to the pro eller in a straight path substantially in paral el to the longitudmal arms of the tube, I have provided means wh ch will lead the water in the manner descrlbed to the edge of the pro eller, so that the latter can operate to its fu efficiency.

- My improvement is described in the fol lowing specification and illustrated in the accompanying drawings, in which:-

Figure 1 is a longitudinal'section of the fore port on of a boat, showing my improved ropelllng device in longitudinal section,

ig. 2 is a plan view thereof, and Fi 3 is a transverse section through the inta e tube on the line at.

The boat is shown exactl in the manner described in the Letters atent abovereferred to.

In Figs; 1 and 2, 1 represents the hull of. v

the boat, 3, 4 and '5 the keel, of usual construction, 6 is, the inlet tube with the, inlets 7 onv either side of the bow. In a suitably widened portion 9 of the tube 6 is disposed the propeller 11-, suitably operated by shaft 15. A thrust bearing 22 is provided ,in yoke 21, suitably fastened to the portion. 10 of the tube, WhdCh fOIIDS the 'ressure chamber of the system, as described in the patent aboye referred to. The water is discharged from chamber 10 preferably in the same manner as described in said patent by means of the two discharge tubes 17, terminating at the bottom ofthe boat, one on either side of the keel and preferably not farther back than amidshi s. In intake tube 6 are radially disposed an fixed a suitable number of plates or artitions 18, extending from the suction si e of the ro'peller' (Fig. 1) a suitable distance toward the mouth of tube-6 substantially in parallel to the longitudinal axis of the tube.

he plates 18 are brought as close to ropeller 11 asmechanical reasons will al ow,-

and are suitably shaped near the hub of the propeller at 23 to conform with the conical shaped end 20, of the'propeller hub, which is provided on this hub for the purpose of de fleeting water in the central portion of the tube toward the propeller blades. The mouth 7 of the tube may be covered by a screen or grid 2 of suitable size so as to keep foreign matter, floating on the water, out of the tube without obstructing the free flow of the water into the tube. The water, which has in entering tube 6 when the boat is in operation, the natural tendency to flow through said tube in a straight path, will be prevented by latesor walls 18 extending close tolthepgroel er 9 from assuming a rotating or w 'rling motion, caused by the rotation of the pro eller, and be guided in the same straight pat to the prbpeller in which it enters the tube. Thus the propeller can act with its full efficiency upon the body of water which it is to force through the system. The preferred form in which the plates or walls 18 are arranged in tube 6 is shown in the. crosssection in Fig. 3.

While. I have shown in the drawings the preferred form of walls 18, I do not wish to imit myself to this form, as any other man nor of disposing the Walls or means for guiding the water in the manner described above are within the scope of my invention.

What I "claim is: I 1. In a device of the character described, the combination with a tube adapted to conduct fluid, a propeller in said tube adapted to draw the fluld into said tube at one end and discharge same at the other endj of means disposed in the suction side of said tube conforming snugly to the shape of said propeller before it reaches said propeller.

2. In a device of the character described ropeller, and extending a suitable distance the combination with a tube adapted to conl duct fluid, a propeller in said tube adapted to nall'y of said tube, to prevent a whirling modraw the fluid into said tube at one end'and tion of thefiuid before t reaches the re eller.

5 discharge same at the other end; of a suitable ALBERT RICHARD E SZ.

number of fixed Walls disposed-radially in the e Witnesses suction side of said tube snugly to said pro- JOHN M. REINER,

peller. and conforming 'ilviththe shape of said H. ALFRED J AUKE.

rom said ropeller, substantially longitudi- 13 

